Clamp for concrete forms



Jan. 17, 1928..

L. A.'CHRISTY ET AL' CLAMP FOR CONCRETE FORMS Filed July 5. 1927 AT TCsRNEY Patented Jan. 17, 1928.

UNITED STATES 1,656,420 PATENT OFFICE.

LEE A. CHRISTY AND GEORGE E. DOLPH, or DALLAS, TEXAS.

CLAMP FOR CONCRETE FORMS.

Application filed July 5, 1927. Serial No. 203,342.

This invention has for its object to provide an improved device for fastening to gether panels, boards or the like used in constructing forms or molds'where concrete is poured in making pillars, columns, and the like in the construction ofconcrete and steel buildings. The invention is further ap plicable to forms or molds of various sorts which require fastening of the parts together to make the form. hen applied and used in making forms which require a box-like receptacle in which concrete is to be poured the device enables the work to be considerably expedited, in that the boxing or parts constituting the form can be put together and taken apart in much quicker time than heretofore.

The invention will be clearly understood from a perusal of the following detailed d e scription taken in connection with the ac companying drawings and wherein:

Figure 1 represents a perspective view in part of a form or boxing in which concrete is to be poured and illustrating an embodiment of the device.

Figure 2 is a sectional View along the line 2'2 of Figure 1.

Figure 3 is a side elevational view of the device removed from the form or boxing.

Figure 4: represents a partial top plan view of a form and illustrating a modification of the device; and

Figure 5 is a side elevational view of the modified form shown in Figure 4:.

In the construction of buildings of concrete and steel, and to which the device is es-' pecially adapted. the forms are fastened together by cross-pieces, that is the cross-pieces are nailed to the panels or boards comprising the box or form into which the concrete is poured. This requires unnecessary time and labor both in the making of the form and removing it.

In carrying out the invention a plurality of cross-pieces 1 preferably 2X4 ft. of required length are fastened together by nails, bolts 2 or otherwise to-enable each piece to pivot on the other for free movement in encircling the forms.

The device comprising the invention consists of a piece of steel or other metal 3 flating the free portions of the 2 01 cross'pieces on which no bolts or nails are used. Since the pieces 1 in position around the form 5 overlap one another the recesses 4 are formed one abovethe other to enable the body of the cross-pieces l to be received.

A particular feature of the invention resides in the construction of the steel or metallic element and wherein the inner edges of the recesses at 6 are made sharp. Thus as shown in Figure 2 after the form is made, the element 3 in place and the concrete poured, the walls of the form, being pushed outwardly by the concrete will cause the sharp edges ('1 to bite into the cross-pieces 1 and firmly hold the form together. It will of course be obvious also that the fastening elements 3 may be quickly removed after the concrete has set and is hardened.

A modification of the device is shown in Figures 4- and 5 and wherein the steel fastening element has integrally formed and outwardly projecting ears 7. The cars are perforated for the insertion of screws or nails 8 which are driven into the cross-pieces 1.

What is claimed is:

1. A device for fastening together concrete forms in combination with the crosspieces of the form, which comprises a flat piece of metal having recesses in each end said recesses adapted to receive the free portions of the cross-pieces surrounding the form tohold said pieces snugly around the form; the inner engaging portions of the metal forming the recesses having sharp edges which when the form is poured forces said sharp edges into said cross-pieces constituting a grip.

2. A device for fastening together concrete forms in combination with the crosspieces of the form, which comprises a flat piece of metal having recesses in each end, said recesses adapted to receive the free portions of the cross-piecesurrounding the form to hold said cross-pieces snugly around the form; the edges of th-epiece of metal. adjacent said recesses having pro'ecting ears for reception of elements to attac said pieces of metal to said cross-pieces.

In testimony whereof we ailix our signatures.

tened on both sides and each end having a substantially squared recess 4. This piece of metal forms a fastening element for secur- LEE A. GHRISTY. GEORGE DOLPH. 

